Faery Folk

The Good Folk, the Sidhe, the Tuatha de Danaan, and the High Fae are all names for the Faery race. They are tall, slim, good looking, and apparently immortal. They have settled communities on Gaia.

They are not from the Caledon world and live rather in numerous pocket or full dimensions that have stationary gateways which they use to trade or to visit the world of Caledon. 

They are very prone to the dreaming and many died on Gaia when the draining magic could not sustain them. This lead to a mass migration off the world as the magic died. Those who did not die or migrate existed in their dreaming state thinking they were human. Those who migrated are only slowly returning as the old gates between the worlds are opened.